Compiling error 'popen' not declared in this scope

[yygcode]

My work need windows. I use cygwin64 as terminal.
Compile sdcv in cygwin64 would failed with 'popen' not declared error.

This is because popen is not standard ISO C++. The problem can be fix with compiling flag CMAKE_CXX_FLAGS="-U__STRICT_ANSI__". I suggest that you can add the option '-U__STRICT_ANSI__' to the file cmake/compiler.cmake:
~$ git diff
`diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index cf94ed3..f8ebd58 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -23,7 +23,7 @@ elseif (MSVC)
elseif (NOT MSVC)
check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
if (CXX_SUPPORTS_CXX11)

• append("-std=c++11" CMAKE_CXX_FLAGS)

• append("-std=c++11 -U__STRICT_ANSI__" CMAKE_CXX_FLAGS)
  else ()
  message(FATAL_ERROR "sdcv requires C++11 support but the '-std=c++11' flag isn't supported.")
  endif()`

Follows are error details:
~$ git show --oneline
51db56f (HEAD -> master, origin/master, origin/HEAD) Merge pull request #38 from nijel/master
~$ mkdir build; cd build
~$ cmake ..
-- The C compiler identification is GNU 6.3.0
-- The CXX compiler identification is GNU 6.3.0
CMake Warning at /usr/share/cmake-3.6.2/Modules/Platform/CYGWIN.cmake:15 (message):
CMake no longer defines WIN32 on Cygwin!
... ...
-- Configuring done
-- Generating done
-- Build files have been written to: /cygdrive/e/yanyg-data/git/sdcv/build
~$ make
Scanning dependencies of target sdcv
[ 12%] Building CXX object CMakeFiles/sdcv.dir/src/sdcv.cpp.o
[ 25%] Building CXX object CMakeFiles/sdcv.dir/src/readline.cpp.o
[ 37%] Building CXX object CMakeFiles/sdcv.dir/src/libwrapper.cpp.o
/cygdrive/e/yanyg-data/git/sdcv/src/libwrapper.cpp: In constructor ‘{anonymous}::sdcv_pager::sdcv_pager(bool)’:
/cygdrive/e/yanyg-data/git/sdcv/src/libwrapper.cpp:299:48: error: ‘popen’ was not declared in this scope
if (pager && (output = popen(pager, "w")) == nullptr) {
^
/cygdrive/e/yanyg-data/git/sdcv/src/libwrapper.cpp: In destructor ‘{anonymous}::sdcv_pager::~sdcv_pager()’:
/cygdrive/e/yanyg-data/git/sdcv/src/libwrapper.cpp:309:26: error: ‘pclose’ was not declared in this scope
pclose(output);
^
make[2]: *** [CMakeFiles/sdcv.dir/build.make:111: CMakeFiles/sdcv.dir/src/libwrapper.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:100: CMakeFiles/sdcv.dir/all] Error 2
make: *** [Makefile:150: all] Error 2

[zheng7fu2]

👍